大约有 1,824 项符合查询结果（耗时：0.0252秒） [XML]
Select datatype of the field in postgres
...ust way to write that WHERE clause considers that possibility: where table_catalog = ? and table_schema = ? and table_name = ?; But this information_schema view doesn't consider that the DDL might have used domains.
– Mike Sherrill 'Cat Recall'
Mar 20 '15 at 16...
Bash command to sum a column of numbers [duplicate]
... supported by Mac OS X 10.7.4 paste. However, since the POSIX 2008 specification of paste supports -s, this is a deficiency in the Mac OS X version.
– Jonathan Leffler
Aug 15 '12 at 18:56
...
What is PECS (Producer Extends Consumer Super)?
...y type. For the type Animal we can make the type Animal[]
covariant: a Cat[] is an Animal[];
contravariant: an Animal[] is a Cat[];
invariant: an Animal[] is not a Cat[] and a Cat[] is not an Animal[].
Java Examples:
Object name= new String("prem"); //works
List<Number> numbers = new Ar...
How to check size of a file using Bash?
...
If you are looking for just the size of a file:
$ cat $file | wc -c
> 203233
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What is the difference between an annotated and unannotated tag?
...or lightweight tags, the SHA-1 points directly to a commit:
git tag light
cat .git/refs/tags/light
prints the same as the HEAD's SHA-1.
So no wonder they cannot contain any other metadata.
annotated tags point to a tag object in the object database.
git tag -as -m msg annot
cat .git/refs/tags/a...
Why do we need a fieldset tag?
...out:
http://usability.com.au/2013/04/accessible-forms-1-labels-and-identification/
The HTML 4 elements fieldset and legend allow you to layout and organise a large form with many different areas of interest in a logical way without using tables. The fieldset tag can be used to create boxes around s...
Which commit has this blob?
... Good to use in conjunction with git rev-list --objects --all | git cat-file --batch-check='%(objecttype) %(objectname) %(objectsize) %(rest)' | awk '/^blob/ {print substr($0,6)}' | sort --numeric-sort --key=2 -r | head -n 20, which returns you a top 20 largest blobs. Then you can pass blob I...
Insert a line at specific line number with sed or awk
...
inserts at line 8
8 This is Line 8
into file FILE
-i does the modification directly to file FILE, no output to stdout, as mentioned in the comments by glenn jackman.
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Execute and get the output of a shell command in node.js
...ing a rejected promise on failed commands, which can be handled with try / catch inside the async code.
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ElasticSearch: Unassigned Shards, how to fix?
...-assign shards to nodes dynamically. However, if you've disabled shard allocation (perhaps you did a rolling restart and forgot to re-enable it), you can re-enable shard allocation.
# v0.90.x and earlier
curl -XPUT 'localhost:9200/_settings' -d '{
"index.routing.allocation.disable_allocation": ...